UPDATE @ 12:18 AM - Law enforcement officials now say 29 people were injured in the Saturday evening blast. One of those people was injured quite seriously. Additionally, a second explosive device has been found a few blocks from the initial explosion. This device is said to be a "pressure cooker" similar to what was usesd in the Boston Marathon bombing.
UPDATE @ 11:35 PM - New York City Mayor Bill de Blasio says the explosion appears to be have been "intentional".
According to Fox News, several dozen people have been injured in an explosion in New York City. The explosion, which witnesses described as being very forceful, took place just prior to 8:40 this evening on West 23rd Street between 6th and 7th Avenues.